Pulverizing apparatus.



A. GRANGER. PULVERIZING APPARATUS. APPLICATION FILED OCT. 28, 1913.

1, l 1 1,454. Patented Sept. 22, 1914.

IHE NORRIS PETERS 60., FHOTK -LITHO.. WASHINGTON. D. L

ALEXANDER GRANGER, OF BULAWAYO, BHODESIA, SOUTH AFRICA.

PULVERIZING APPARATUS.

Specification of Letters Patent. Patented Sept, 22', 1914 Applicationfiled October 28,1913. Serial No. 797,749. 1

To all whom it mag/ concern Be it known that I, ALEXANDER GRANGER,subject of the King of Great Britain, re-

siding at Bulawayo, Rhodesia,'South Africa, 1

have invented a new and useful Improvement 1n Pulverizlng Apparatus; andI do hereby declare the following to be a full,

line AA Fig. II; and Fig. II is a front View partly in section. 1 is amortar box having a substantial base to serve as a mortar and fittedwith a .removablecover. 2. At the front of the mortar. box is adischarge opening 3 which 'may be fitted with a-s'c reen a or notasrequired; at the back of the mortar box is the feed slot 5 through whichis passed the material to be pulverized. The mortar box carries arotatable shaft 6 which operates one or more pulverizing elements 7 twobeing shown. The said pulverizing elements may vary in form, but'areconveniently circular and may therefore be referred to asi disks. Eachdisk is formed with a slot 8 through which a polygonal portion 9 of theshaft 6 passes with a sliding fit, so that the disk 7rotatespositivelywith the shaft but is free to slide thereon in thedirection of its slot 8. Consequentlyas the disk is rotated it tends todrop at' each half revolution when its slot 8 becomes substantiallyverti cal. The two disksshown are positioned on the shaft withtheirslots 8 at right angles. with one another so that one disk'rotatesa quarterrevolutionin advance ofthe other and drops alternatelytherewith. When there are more; than two disks they are suitablyarranged to operate in sequence.

cured. to the shaft and coveringthe slots 8 of both the disks. Saidcollars 10, 11 are formed with recesses 12 which retain wearing strips13 on the wearing faces of the shaft 6.

The disks are fitted with renewable tires 14 which may be retainedinplace by means of wedges 15 on their inner surfaces. The centralpermanent portion 16 of each disk is provided with peripheral bayonetslots 17, 18 and as the tire is passed laterally onto portion 16, saidwedges are passed through the lateral arms 17 of the bayonet slots. Uponthe tire being then rotated backwardly upon the portion 16, the wedges15 wedge up into the circumferentially wedge-shaped arms 18 of thebayonetslots. Thus the tire is. firmly but removably secured, and-whenworn may be dismounted and replaced in a different position upon theportion 16 to bring fresh wearing surfaces into operative position. Thebayonet slots may be filled with fusible metal when the tire is inplace.

The wearing surfaces of the slots 8 are fitted with renewable liners 19,which may be held in grooves 20 extending from the periphery of theportions 16 of the disks, so that the tires 14 retain said liners 19 inplace.

For each disk there is provided a renewable die 21. The upper surface 22of the die is shaped to form a concave crushing surface extendingsubstantially from the feed aperture 5 to the discharge aperture 4 andbeing preferably of greater radius than the disk 7 The dies 21 are sunkin curved recesses 23 and are retained therein by the fixed lug 24andlthezmovable wedging bar 25. The latter upon. being drawn up by bolts26 presses down the rear end of the die and so brings the die-to a firmbearing on the mortar and against 111g 24. The

front and rear ends of the dies are made symmetrical as shown so thatthe dies may be turned end for end when worn.

The length of the drop of the disks is regulated by raising or loweringthe shaft, 6. For this purpose in the example illustrated each shaftbearing 27 is formed with a saddle extension 28 which is slid over theSecured to the shaft 6 at the outside of,

side of the mortar box and retains packing blocks 29 which sustainthelbearinga The: bearing is held down by bolts 30 taking into themortar box, and the blocks 29 are formed with interlocking steps 31which" prevent their lateral movement while the bearing is held down.Upon unbo-ltingLand raising the te'rsPatent is f j 1-. In a pulverizer,a mortar, a pulverizlng i bearing, one or more packing blocks 29 may bedisengaged and slipped out of the open front 32 ofthe saddle, andanother or others substituted if necessary.

In operation ore is fed into the feed slot 5, water being also added inthe case of wet crushing. Upon the shaft being rotated a disk which isin the position of that shown in the front of Fig. I and at the righthand of Fig. II is rotated eccentrically with the shaft'G and aftermaking a half revolution,- when its slot again becomes substantiallyvertical,- it drops upon and crushes the ore lying on the die. Aftereach drop the continued rotation causes the disk to travel over theforward part of the face of the die 21, and so grind the ore lyingthereon. WVhile being so ground the material is also swept uptoward thedischarge opening 3 and is thus eliminated from the mortar box asrapidly as possible. Owing to their respective slots 8 being at rightangles, the two disks drop and grind alternately "with one another.

As the dies 21 and tires 14 wear away, the height of the drop ismaintained, if necessary, by progressively lowering the shaft 6.However, in practice such adjustment for wear is not usually necessary,since the increased drop due to wear, compensates for the diminisheddropping weight. Consequently the apparatus may be run for long periodswithout adjustment and with no loss of efiiciency; the increased dropnot being a source of danger as it is in a cam actuated stamp.

It will be understood that in order to cause the disks to drop, thecenter of the shaft 6 is positioned at a higher point than the center ofthe disk 7 when the latter is lying on the die, as in Fig. I; thegreater the distance between said points, the greater the drop, which isin fact twice said distance. Conversely by lowering the shaft 6 thelength of the drop and the amount of crushing done are reduced, whilethe grinding effect remains substantially unchanged; and in the limitingcase when the distance between the die and the center of the shaft 6 isequal to the radius of the disk 7, crushing is eliminated and theoperation is one of grinding only. The tires wear principally at theparts adjacent to the ends of the slot 8, and when so worn they may betaken off, turned a quarter revolution and replaced for further use.Similarly the dies wear principally at their front ends and may beturned end for end when worn.

By reason of its grinding action the a paratus is well adapted toamalgamate prec'i'ous'metal o-res while reducing them.

'WhatIclaim and desire to secure by Letbody formed with a diametralslot, and a rotatable shaft passing through said 'body and having anon-circular portion which engages in the slot to rotate positively the'body while leaving it free to slide transversely on the shaft, saidbody being posi tioned to cooperate with the mortar.

2. In a pulverizer, a mortar providing a crushing surface, a pulverizingbody formed with a diametral slot, and a rotatable shaft passing throughsaid body and having a non-circular portion which engages inthe slot torotatepositively the body while leaving it free to slide transversely,said shaft being elevated above the crushing surface by a distancegreater than the radius of the grinding body, whereby the body is causedto dropas the shaft rotates. V

3. In a pulverizer,' a mortar, a plurality of pulverizing bodies eachformed with a diametral slot, and a rotatable shaft passing through saidbodies and having a non-circular portion which engages in said slots. torotate positively the bodies while leaving them free to slidetransversely thereon, the slots of the different bodies being disposedin different radial directions from onev another. a

4. In a pulverizer, a mortar, a pulverizing body formed with adiamet'ral slot, a ro-' tatable shaft passing through said body andhaving a non-circular portion which engages in the slot to rotatepositively the body while leaving it free to slide transv versely on theshaft, and collars fixed to. the" shaft and covering said slot. S

5. In a pulverizer, a pulverizing body formed with a diametralfslot, arotatable I shaft passing through said bodyand having a non-circularportion which engages in the slot to rotate positively the body whileleav ing it free to slide transversely on the shaft whereby the, bodytends to be raised and to fall during each semi-revolution of the shaft,and a mortar havinga crushing surface disposed for the body to move overwhile rotating after thedrop.

6. In a pulverizer,"a pulveri zing body formed with a diametral slot,-arotatable shaft passing through said body and having anon-circularportionwhich engages in the slot to rotate positively the body whileleaving it free to slide transversely on the shaft whereby the bodytends to be raised and to fall during each semi-revolution of the shaft,and a mortar having an arcuate crushing surface disposed for the body towith a diametral slot, a rotatable shaft pass--- ing through said bodyand havin circular portion which engages the slot to rotate positivelythebody while leaving it free to slide transversely of the shaft. j

v 8. In a pulverizer, a mortar having a rear feed aperture a frontdischarge aperture and a concave crushing surface extending between saidapertures, a pulverizing body 00- operating with said surface and formedwith a diametral slot, a rotatable shaft passing through said body andhaving a noncircular portion which engages the slot to rotate positivelythe body while leaving it free to slide transversely of the shaft,

ALEXANDER GRANGER.

Witnesses:

VVEsLEY E. J oHN, GHAs. B. HENDERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of .Patents,

Washington, I). C.

